So I have just placed a order for the CMT Monolithic Lower with PDW Stock and will build it into a SBR. I have a few questions about the process as I have never purchased/built a NFA firearm before.
First of all I am going the gun trust method. OK in Colorado.
1) Do I need to have the lower in hand to file the form 1. - I know I need to submit the dimensions on the form 1 , do I need to know the original serial number the factory assigned to the lower? Or will I only be asked for the "new" serial number I assign to the lower with the name of my trust.
- I am asking these questions because I purchased the lower on layaway. Since it will be a while before I get the tax stamp I am trying to determine what the most efficient use of my money is. Ultimately I would like to set up the trust and file for the tax stamp before I am in physical possession of the lower. Is this possible?
2) Is it true that once I get the stamp: Lower is registered as a SBR, I am able to change the configuration from the specifications it was registered originally? To explain, for example on my form 1 the SBR is registered with a 10" 5.56 upper. Six months later I get a 8" 300blk Upper and attach it to my SBR lower, is that legal to do? To change the configuration to a shorter barrel in a different caliber? Would I need to hold on to the upper I used when I originally registered the SBR, or would I be allowed to sell it?